Lower bounds for pseudo-differential operators
Séminaire Goulaouic-Schwartz (1989-1990), Exposé no. 1, 8 p. 
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     year = {1989-1990},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     zbl = {0729.35151},
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     url = {https://www.numdam.org/item/SEDP_1989-1990____A1_0/}
}
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Lerner, N.; Nourrigat, J. Lower bounds for pseudo-differential operators. Séminaire Goulaouic-Schwartz (1989-1990), Exposé no. 1, 8 p.. https://www.numdam.org/item/SEDP_1989-1990____A1_0/

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